18647725

素因数分解:

$5^2\times {\mathrm{17}}^2\times {\mathrm{29}}^1\times {\mathrm{89}}^1$

素因数の和:162

約数の個数: 36

約数和(自身を含む): 25695900

約数和(自身を除く): 7048175

約数列:

[1, 5, 17, 25, 29, 85, 89, 145, 289, 425, 445, 493, 725, 1445, 1513, 2225, 2465, 2581, 7225, 7565, 8381, 12325, 12905, 25721, 37825, 41905, 43877, 64525, 128605, 209525, 219385, 643025, 745909, 1096925, 3729545, 18647725]

約数ペア:

[(1, 18647725), (5, 3729545), (17, 1096925), (25, 745909), (29, 643025), (85, 219385), (89, 209525), (145, 128605), (289, 64525), (425, 43877), (445, 41905), (493, 37825), (725, 25721), (1445, 12905), (1513, 12325), (2225, 8381), (2465, 7565), (2581, 7225)]